High Carbon Cold Drawn Steel Wire is a precision-engineered steel product created by cold drawing high-carbon wire rod through a series of tungsten carbide or diamond dies. This process refines the grain structure, raises tensile strength, and delivers tight dimensional tolerance. Luguan supplies high carbon cold drawn steel wires to manufacturers in the automotive, spring, wire rope, fastener, and industrial equipment sectors. The product is produced in diameters from 0.15 mm to 16.0 mm and can be customized for strength, surface finish, coating, and coil weight. Because of its high strength and fatigue resistance, it is widely used in dynamic applications where consistent performance and long service life are required.
Because of its high tensile strength, fatigue resistance, and consistent dimensional control, high carbon cold drawn steel wire is used across many demanding industries. Luguan supplies both standard grades and application-specific variants.
Luguan high carbon cold drawn steel wire is manufactured under an ISO 9001 quality management system. The product can be supplied according to international standards, including ASTM A227/A227M for general-purpose spring wire, ASTM A228/A228M for music spring wire, EN 10270-1 for patented cold drawn spring wire, JIS G3521 for hard drawn steel wire, and DIN 17223 for round spring steel wire. Mill test certificates document heat number, chemical composition, diameter tolerance, tensile strength, reduction of area, torsion, and surface condition. Third-party inspection is available upon request.
Luguan provides consistent high carbon cold drawn steel wire with documented quality control and flexible custom options. The company operates modern drawing lines with in-line laser diameter gauges and eddy current testing to detect surface defects during production. This ensures every coil meets the specified tolerance and surface requirements before it leaves the factory.
Q: What is the difference between high carbon cold drawn steel wire and mild steel wire?
A: The main difference is carbon content and resulting mechanical properties. High carbon cold drawn steel wire typically contains 0.60% to 1.25% carbon, while mild steel wire generally contains less than 0.25% carbon. Because of the higher carbon level and the cold drawing process, this product achieves tensile strengths between 1,200 MPa and 2,600 MPa, compared with roughly 350 MPa to 700 MPa for mild steel wire. High carbon cold drawn steel wires also offer better fatigue resistance and spring properties, but it has lower ductility than mild steel wire.
Q: What tensile strength can Luguan supply?
A: Luguan can supply tensile strengths from 1,200 MPa to 2,600 MPa depending on the final diameter and production route. For small diameters from 0.20 mm to 0.50 mm, the typical range is 2,200 MPa to 2,600 MPa. For diameters from 1.00 mm to 2.00 mm, the range is usually 1,800 MPa to 2,250 MPa. For larger diameters from 8.0 mm to 16.0 mm, the range is generally 1,200 MPa to 1,600 MPa. Intermediate values can be achieved by adjusting carbon content, total drawing reduction, and heat treatment. Luguan also produces stress-relieved or patented wire with a different balance of strength and ductility.
Q: What surface finishes are available?
A: The standard surface finishes are bright, phosphate-coated, zinc-coated, and copper-coated. Bright finish has a smooth metallic surface and is suitable for further processing or when no coating is needed. Phosphate coating provides a fine zinc-iron phosphate layer that improves forming, drawing, and coating adhesion. Zinc coating offers corrosion resistance for outdoor or humid environments. Copper coating is often used for welding wire or where electrical conductivity is required. Luguan can control the phosphate coating weight between 5 g/m² and 10 g/m², and other coating weights can be supplied on request.
Q: What coil weights and packaging does Luguan offer?
A: Luguan can supply coil weights from 50 kg to 2,000 kg, depending on wire diameter and customer handling equipment. Packaging options include horizontal coils, vertical carriers, spools, and cut-to-length bars. For export shipments, Luguan uses VCI paper, plastic film, and steel strapping to protect the wire from moisture and corrosion during transit. Custom coil inner diameters and weights can be arranged to match automated feeding systems. If you have specific packaging requirements, Luguan engineers can recommend the most cost-effective solution.
Q: Can Luguan supply custom diameters and tolerances?
A: Yes. Luguan produces standard diameters from 0.15 mm to 16.0 mm, but intermediate sizes can be drawn to customer drawings. Tolerances can be tightened to ±0.005 mm for small diameters and ±0.01 mm for medium sizes. For applications that require very precise outer diameter control, in-line laser gauges monitor the wire during drawing and automatically adjust the process. To define a custom product, it is helpful to provide target diameter, tolerance, tensile strength range, surface finish, coil weight, and the intended application. Luguan engineers can then propose the most suitable drawing schedule and heat treatment.
Q: How does Luguan inspect high carbon cold drawn steel wires quality?
A: Luguan performs incoming inspection of wire rod chemistry before production. During drawing, the wire diameter is monitored continuously with laser gauges, and eddy current testing is used to detect surface defects. After drawing, each coil is tested for tensile strength, reduction of area, torsion, and surface roughness according to the relevant standard. Coating weight and adhesion are verified for coated products. Every coil is labeled with heat number, diameter, tensile range, and net weight for full traceability. Mill test certificates are provided with each shipment, and third-party inspection can be arranged.
